When contamination was found out of bounds last Friday, workers didn’t notify upper managers for more than a day. Then there was a wind storm over the weekend, that might have spread the contamination further.

Managers say no airborne contamination has been found so far.

Now instead of working on tear down, 183 workers are working on shoring up any areas with contamination by spraying fixative on the ground, and painting.

The U.S. Department of Energy is already a year behind on its legally-binding cleanup deadline.